Double acting pump for wells



March 12, 194.

. G. W. WALKER DOUBLE ACTING PUMP FOR WELLS Original FiledAug. 19, 1957l l I 3 Sheets-Sheet l I Q1 W W&/fl" r By 5mm March 12, 1940. G w L ER2,193,150

DOUBLE ACTING PUMP FOR WELLS Original Filed Aug. 19, 1937 3 Sheets-Sheet2 By Q i z w .4 iiorneys March 12, 1940, G w, LKER 2,193,150

DOUBLE ACTING PUMP FOR WELLS Original Filed Aug. 19, 1937 3 Sheets-Sheet5 Q Inventor Qi/m/d/fir Aiiorneys Patented Mar. 12, 1 940 George W.Walker, Golden Meadow, La.

Application August19, 1937, Serial No. 159,962 Renewed August 25, 1939 1Claim.

The present invention relates to double acting or double stroke pumpsfor use in pumping liquid in oil wells, water wells, or the like, andhas for its principal object to provide a pump housing adapted to belowered into the well together with the well tubing and forming a partof said tubing to position the pump at the most effective level of thewell.

A further object is to provide a double acting pump of this character ofsimple and practical construction, which is efiicient and reliable inperformance, relatively inexpensive to manufacture and maintain inoperative position, and

otherwise well adapted for the purposes for which the same is intended.

Other objects and advantages reside in the details of construction andoperation as more fully hereinafter described and claimed, referencebeing had to the accompanying drawings forming part hereof, wherein likenumerals refer to like parts throughout, and in which:

Figure 1 is a sideelevational view of the pump housing shown connectedto the well tubing.

Figure 2 is a vertical sectional view therethrough.

Figures 3, 4, and 5 are transverse sectional views taken respectively onthe lines 33, 4-4, and 5-5 of Figure 2. t

Figure 6 is an enlarged fragmentary sectional view showing the pumpcylinder and piston.

Figure 7 is an enlarged fragmentary sectional view of the upper chamberof the pump housing.

Figure 8 is a detail in section of the check valve for the upper end ofthe tube.

Figure 9 is a perspective view of one of the tubes; and

Figure 10 is a detail in section of one of the,

connectors for the rod coupling.

Referring now to the drawings in detail, wherein, for the purpose ofillustration, I have disclosed a preferred embodiment of the invention,the numeral 5 designates .a cylindrical pump housing including anintermediate section 6, upper and lower sections l' and 8, respectively,and upper and lower reducing sections 9 and I0, re-

spectively. Each of the above mentioned sections is connected by unionsll having partitions I2 formed integrally therewith and separating thepump housing into chambers I3, l4, 15, I6, and I1, positioned in theorder named from the top to thebottom of the casing, as will be apparentfrom an inspection of Figure 2 of the drawings.

A plurality of tubes I8 threaded in the uppermost partition I 2 providecommunication between the chambers l3 and I4, while a plurality of tubesl9 extend from the chamber Hi to the lowermost chamber ll; while aplurality of tubes 20 extend from the upper chamber is to the chamber 16and a plurality of tubes 2! extend through the lowermost partition andprovide communication 5 between the chambers It and I7.

Each of the tubes is threaded at its upper end for threadedly receivinga valve seat cap 22 having a cage 23 extending upwardly therefrom forretaining a ball check valve 24 in position therein, 10 said ball checkvalves controlling communication through the respective tubes.

Each of the partitions is also provided with a central opening, thepartitions defining the ends of the intermediate section 6 of thehousing hav- 15 ,ing the chamber l5 therein have threadedly connectedthereto a pump cylinder 25 which extends entirely through the chamber l5and provides communication between the chambers i l and i6. The upperpartition l2 has a guide cylinder or 20 tube 26 centrally positionedtherein in vertical alignment with the pump cylinder 25, while thelowermost partition is provided with a central enlarged tube 21 having acheck valve assembly 28 mounted in its upper end, the last named tube 25providing communication between the chambers l5 and H.

A piston 29 has a working fit in the cylinder 25 and has a piston rod 38connected thereto extending upwardly through the guide tube 26. 30

The upper section 9 of the housing has a reduced neck 3| extendingupwardly therefrom, and the lower section ill of the pump housing has asimilar neck 32 extending downwardly therefrom for connecting to thewell tubing 33 by a union 35 3 The piston rod 30 is formed of sectionsconnected to each other by a threaded coupling 35. The guide tube 2% isalso provided with a packing 36 through which the piston rod 33 isslidably inserted. 40

In theoperation of the device, when the pump housing is lowered in thewell, a down stroke of the piston 29 will cause fluid in the chamber itto be forced upwardly through the tubes 2@ past the check valve at thetop thereof into the upper 45 chamber 13. At the same time the downstroke of the piston will produce a vacuum in the chamber I 3 causingthe check valve at the top of the tubes IE! to open and drawing liquidfrom the lower chamber I! upwardly into the chamber I4. 50 An up strokeof the piston 29 will produce a suction in the chamber It resulting inan opening of the check valve in the upper ends of the tubes 2| and 21for drawing fluid upwardly from the chamber ll into the chamber Hi. Suchupward 55 stroke of the piston will at the same time create a pressurein the chamber Hi forcing fiuid therefrom upwardly through the tubes l8into the chamber 53.

The several tubes connecting the various chambers may be in sections andconnected by collars or sleeves, the tubes preferably being threadedlyconnected to the respective partitions. It will also be apparent thatthe piston may be pulled with the piston rod for repairs or replacementwithout the necessity of pulling the tubing or'pump. v

Having thus described the invention, what I claim is:

A double acting pump comprising a pump housing formed of a plurality ofinterconnected tubular sections, said housing including upper and lowerend sections having reduced necks for attaching to a well tubing, acentral intermediate section and upper and lower intermediate sectionsat each end of the central intermediate section and interposed betweenthe central intermediate section and the respective upper and lower endsections, partitions separating the sections and defining compartmentsin the housing, a pump cylinder open at each end and communicating withboth of said upper and lower intermediate sections, a piston having aworking fit in said cylinder, tubes providing communication with theupper intermediate section and the lower end section, tubes providingcommunication between the lower intermediate section and the upper endsection, tubes providing communication between the respective upper andlower intermediate sections and the adjacent end sections and checkvalves for each of said tubes.

GEORGE W. WALKER.

